The dominant role of solar Lyman-alpha in D-region radio wave absorption

Details The dominant role of solar Lyman-alpha in D-region radio wave absorption The dominant role of solar Lyman-alpha in D-region radio wave absorption

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..793l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Sept. 1982, p. 793-795.

Physics

7

Atmospheric Attenuation, D Region, Lyman Alpha Radiation, Radio Waves, Solar X-Rays, Radiant Flux Density, Radiation Measurement, Solar Flares

Scientific paper

Simultaneous measurements of solar Lyman-alpha and X-ray fluxes are considered in relation to radio wave absorption data on 2775 kHz, showing that Lyman-alpha radiation dominates the absorption under non-flare conditions. Optimum equations are derived, revealing an m value (for the absorption/ionization proportionality), of 1.1-1.5. It is noted that the data used were obtained during June, July, and August 1969, 1970, and 1972, which were periods of high solar activity. At a correction factor of approximately 3, X-ray influence on absorption and D-region ionization are greater, but Lyman-alpha influences remain predominant.

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